System and method for integrating session initiation protocol communication in a telecommunications platform

ABSTRACT

A system and method for facilitating signaling and media communication at a communication platform that includes receiving a communication request to a resource, wherein the communication request specifies a destination endpoint; establishing signaling and media communication in a session with the destination endpoint of the communication request; registering a callback resource to a signaling event of the session; monitoring signaling messages of the session; detecting the signaling event in the signaling messages of the session; and triggering the callback resource upon detecting the signaling event.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of prior U.S. application Ser. No.14/208,920, filed on 13 Mar. 2014, which claims the benefit of U.S.Provisional Application Ser. No. 61/783,134, filed on 14 Mar. 2013, allof which are incorporated in their entirety by this reference.

TECHNICAL FIELD

This invention relates generally to the telecommunications platformfield, and more specifically to a new and useful system and method forintegrating session initiation protocol communication in atelecommunications platform in the telecommunications platform field.

BACKGROUND

Session Initiation Protocol (SIP) is a signaling protocol often used inestablishing communication sessions. Such communication sessions caninclude voice, video, messaging, and other forms of communication. SIPis meant to be an application layer that is independent of the transportlayer. Working with SIP to build applications and provide services mayrequire a specialized skill set, and building applications on top of SIPmay be challenging for some developers. In some cases, setting up a SIPendpoint may pose challenges to those hoping to do so quickly andeasily. Thus, there is a need in the telecommunications platform fieldto create a new and useful system and method for integrating a sessioninitiation protocol communication in a telecommunications platform. Thisinvention provides such a new and useful system and method.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic representation of a system of a preferredembodiment;

FIG. 2 is a flowchart representation of a method of a preferredembodiment.

FIG. 3 is sequence flow diagram of a method for implementing outboundSIP communications of a preferred embodiment;

FIG. 4 is a schematic representation of a variation of outsidecommunication to a platform endpoint being mapped another endpoint;

FIG. 5 is a schematic representation of an account holder directingoutbound communication through the communication platform;

FIGS. 6A and 6B are schematic representations of an exemplary use ofestablishing a communication session from an application programminginterface call;

FIG. 7 is a schematic representation of communication nodes in aterminating use case;

FIG. 8 is a detailed sequence flow diagram of a terminating use case;

FIG. 9 is sequence flow diagram of a method for implementing inbound SIPcommunications of a preferred embodiment;

FIG. 10 is a schematic representation of communication nodes in anoriginating use case;

FIG. 11 is a detailed sequence flow diagram of an originating use case;

FIG. 12 is a schematic representation of an exemplary screenshot of aaccount routing configuration panel;

FIG. 13 is a schematic representation of an exemplary screenshot of aform to create a signaling and media endpoint with embedded parametersfor a signaling application module;

FIG. 14 is an exemplary application of a signaling application module;

FIG. 15 is a sequence flow diagram of an exemplary use of a callback forerror handling

FIG. 16 is a schematic representation of a method for registering a SIPendpoint of a preferred embodiment;

FIG. 17 is a schematic representation of an implementation of a methodfor registering a SIP endpoint of a preferred embodiment;

FIGS. 18 and 19 are sequence flow diagrams of methods for transitioningcommunication modes of a preferred embodiment;

FIGS. 20A-20D are schematic timeline representations of promoting anddemoting a communication session;

FIG. 21 is a sequence flow diagram of one variation of a call transferupgrade;

FIG. 22 is a sequence flow diagram of one variation of upgrading a basiccommunication through a REFER to a public-SIP-in;

FIG. 23 is a sequence flow diagram of one variation of upgrading a basiccommunication through a REFER to a public-SIP-out; and

FIG. 24 is a sequence flow diagram of one variation of upgrading a basiccommunication through a REFER handled through an edge service.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following description of preferred embodiments of the invention isnot intended to limit the invention to these preferred embodiments, butrather to enable any person skilled in the art to make and use thisinvention.

1. System for Integrating Session Initiation Protocol in a Platform

As shown in FIG. 1, a system for integrating session initiation protocolcommunication in a telecommunications platform is preferably acommunication platform facilitating at least bridging communicationendpoints through a signaling and media protocol in combination withdynamic programmatic responsive mechanisms. The communication platformis preferably a system substantially similar to the telephony platformdescribed in U.S. patent application Ser. No. 12/417,630 filed 2 Apr.2009, which is incorporated herein in its entirety by this reference.Herein, SIP is used in describing the signaling and media protocol, butany suitable protocol may alternatively be used in place of SIP. Thesystem preferably functions to bridge signaling and media traffic withapplication layer interactions. Combining SIP-based communication withHTTP callbacks (or other suitable form of application layer callbacks)can enable a HTTP request/response application model in supplementingSIP communications with information and/or logic. The system can provideSIP trunking (e.g., originating and/or terminating variations), andlogic can be integrated into the communication flow in a dynamic andcustomizable manner. Preferably, SIP data and/or other parameters fromthe communication session can be passed as parameters in the HTTPrequest transmitted to the callback resources, which can then track,react to, and/or alter the state of the communication session. Otherparameters set within an account record, through an API request,embedded in the signaling communication can be used to enable variousfeatures and/or responses to the communication.

The system can be distributed across multiple regions. Each region caninclude carrier edge services, public SIP edge services, client edgeservices, a proxy core service, a trunking application, and optionally acommunication application service. The system is preferably amultitenant platform wherein a plurality of different distinctusers/accounts operates within the same infrastructure of the system.The system can include an account system, a billing system, andadditionally services or components to facilitate other features andcapabilities of the system. For example, the system can include eventlogging system, analytics system, recording services, conferencingservices, communication queues, text-to-speech (TTS) services,transcription services, and/or any suitable component. A carrier edgeservice preferably functions to route all traffic to and from a carrier.An edge can be defined as a load balancer and asession-border-controller. A public SIP edge service preferablyfunctions to route all traffic to and from a public SIP endpoint(trunking and non-trunking). A client edge service preferably functionsto route all traffic to and from client applications of thecommunication platform (e.g., web applications or applications using SDKto interface through SIP with the communication platform).

The proxy core is preferably a component that manages/touches traffic ofthe communication platform as a communication router. The proxy corefunctions to making routing decisions for incoming and outgoingcommunications. For an incoming PSTN call (from a carrier to the carrieredge service to the proxy core), the proxy core determines if this is atrunking use case or an application use case. If a trunking use case,the proxy core signals to the trunking application. If an applicationuse case, the proxy core signals to a communication application service.The use case is preferably determined based on the mapping of thedestination number to a routing configuration identifier (e.g., a SIPaddress or an application URI). The proxy core additionally includes acallback engine that monitors SIP transaction messages and can initiaterequest response interactions with a callback resource over anapplication layer protocol in response to signaling and/or media events.Callback URIs are preferably configured for the communication platformthrough an API, a control user interface, or any suitable controlmechanism. The communication platform may additionally include aregistration record database. The registration record database ispreferably used in maintaining routing information for devices thatregister a communication endpoint with the communication platform.

A trunking application functions to implement trunking functionalitysuch as taking care of REFER SIP messages. In some implementations, thesystem can include communication application service. The communicationapplication service preferably provides a higher level of communicationapplications such as voice based applications to play recordings,perform TTS, capture input caller, record messages, connect otherendpoints, or control any suitable interaction during a communicationsession. Preferably the communication application service can functionsubstantially similar to a call router that processes a document oftelephony instructions such as in U.S. patent application Ser. No.12/417,630.

The system can be operated to provide variety of different features. Thesystem as one aspect can include registering and triggering callbackresources, which function to make SIP trunking sessions reactive tosignaling and media events. As another aspect, the system can use aunified registration system so that a phone number (or other suitableendpoint identifier) can be configured to perform trunking or run acommunication application; further, fallback/error responses can bedefined for either trunking or application execution. For example, thesystem can enable a SIP-URI to be associated with a phone number as amain mechanism for communication, but if the communication does fail, afailure callback can specify an application resource or another SIP-URI.In the case of a SIP-URI, the call can failover to the secondary SIPdomain for trunking. In the case of an application resource (e.g.,preferably specified as a URI of an application resource), then thatapplication can be executed. Such a unified communication endpointregistration can similarly be used where an incoming call is initiallyhandled by an application and fails over to a SIP-URI. As an example, acustomer may have capacity for a set number of concurrent phone calls,and when the customer hits that limit, the system can automaticallyhandle the overflow in accordance to the fallback resource. In thisexample, the unified registration for a number +1-415-555-1234 can havean incoming resource set as “sip:pbx.example.com” and a fallbackcallback as http://example.com/sorry.xml”. Then if the SIP server atsip:pbx.example.com is busy and responds with an error response, thesystem can access the fallback callback application. That callbackapplication could play an error message or place in a queue until anagent is available or any suitable application logic.

Similarly, select media features such as recording may be enabled duringa trunking communication session. An additional aspect can enable acommunication session to dynamically transition between operating modeswhere a communication session may be established in a low-level trunkingmode and then elevated to enable application processing or other mediafeatures. Operational mode transitioning can provide better use ofresources and possibly allow customers to selectively reduce accountusage (and consequently lower platform cost). As another element of thesystem, a signaling application module can function to providecustomizable signaling endpoints wherein a signaling application modulewill extract and use embedded data of the endpoint identifier to altersignaling. The system is preferably configured to perform any suitablecombination and/or subset of processes of the methods described above.

2. Session Initiation Protocol Communication in a Platform

As shown in FIG. 2, a method S100 for integrating session initiationprotocol communication in a telecommunications platform of a firstpreferred embodiment can include receiving an outgoing communicationrequest to a resource S110, establishing signaling and mediacommunication in a session S120, registering a callback resource to asignaling event of the session S130, monitoring signaling messages ofthe session S140, detecting the signaling event in the signalingmessages of the session S150, and triggering the callback resource upondetecting the signaling event S160. The method functions to bridgesignaling and media traffic with HTTP as shown in FIG. 3. The method ispreferably used in communications using SIP as a communication protocolbut may alternatively be used in any suitable signaling and mediacommunication protocol. Combining SIP-based communication with HTTPcallbacks can enable a HTTP request/response application model insupplementing SIP communications with information and/or logic.Preferably, SIP data and/or other parameters from the communicationsession can be passed as parameters in the HTTP request transmitted tothe callback resources, which can then track, react to, and/or alter thestate of the communication session. The method is preferably implementedwithin a multitenant communication platform. The callback resourcesconfiguration is preferably stored and maintained for a plurality ofaccounts and/or sub-accounts.

The method can be applied to several different signaling and messaginguse cases and communication topologies.

The method can be applied to terminating and originating SIP trunkingscenarios. In the terminating use case described in more detail below,the call could originate from a PSTN endpoint, an outside SIP endpoint,an internal SIP endpoint, or any suitable type of endpoint. Theterminating endpoint preferably depends on mapping of a destinationendpoint to a SIP endpoint as shown in FIG. 4. The originating use casecan allow account holders to make outbound SIP communication requeststhrough the communication platform in association with their account.Originating outbound communication requests can include a layer ofauthentication to facilitate interfacing with outside endpoints onbehalf of an account as shown in FIG. 5. Furthermore, there can betranslation between the specified destination and the actual intendeddestination endpoint. In yet another variation, the signaling and mediacommunication can be initiated through an API request, and the callbackcan be triggered during a signaling event between the communicationplatform and a communication endpoint. In one example, shown in FIG. 6A,an API request could initiate a call to a SIP endpoint (stages 1 and 2in FIG. 6A); the signaling event of someone answering could result inretrieval and processing of callback resource that instructs the call toconnect to another endpoint (e.g., a PSTN endpoint in the example ofFIG. 6A). This API variation could similarly be applied in initiallycalling a PSTN number and connecting a SIP endpoint as shown in FIG. 6B.Such use cases may be applicable in connecting a customer and a customerservice agent in response to an interaction on a website or mobile app.

Block S110, which includes receiving a communication request to aresource, functions to prompt, start or initiate a communicationsession. The resource in one variation can be to an endpoint with anaccount routing configuration (e.g., outside entities make a call intothe communication platform). This variation will be discussed in moredetail in method S200. The resource may alternatively be directed to anoutside endpoint through the communication platform (e.g., PBX of anaccount holder sending an INVITE to415-xxx-xxxx@<accountID>.<platform_domain> to make an terminationtrunking call to 415-xxx-xxxx). The request preferably includes aspecified destination. The communication request can be received as asignaling message directed at a domain of the platform, where thesignaling message is requesting to establish a media communicationsession with a communication endpoint. The outgoing communicationrequest can be received as the platform facilitates SIP trunkingtermination. For example, a customer could be enabled to use a deskphone or a call center workstation behind an IP PBX to make a call to acell phone or landline as shown in FIG. 7. When using SIP, the signalingmessage may be an INVITE, a REFER, or other suitable type of signalingmessage. The signaling message can originate from an IP public branchexchange (PBX) system that can reside off-premise (e.g., on-premise at acustomer's infrastructure) as shown in FIG. 8. Alternatively, an IP PBXsystem can operate within the platform on behalf of one or moreaccounts. The signaling message can include an authentication token. Anauthentication token could be account credentials, an HMAC, a signeddata package, or any suitable token used in verifying authenticity ofthe message. In one variation, authentication tokens can be passedthrough header parameters of the SIP request. Alternatively, receivingan outgoing communication request can include identifying an account ofthe communication platform that is mapped to a domain identifier of theoriginating endpoint (e.g., the domain of the SIP address) or theoriginating IP address. The credentials can be authenticated andverified as a request made on behalf of an account. If the credentialsare successfully verified, the platform can establish mediacommunication with the destination of the outgoing communication. Theoutgoing communication request can additionally include feature headersthat specify communication features such as analytics, recording, mediaprocessing, transcription, or other suitable media properties. Theoutgoing communication request can additionally specify a callbackresource to register for the session.

An outgoing communication may alternatively be initiated in response toan application programming interface (API) request of atelecommunications platform. The API request is preferably transmittedon behalf of an associated account and received at an API service of theplatform. For example, an application or outside entity may make an APIrequest to the communications platform to make an outgoing SIP basedcall. The outgoing communication may additionally be initiated from atelephony instruction in a communication application. In this use casethe communication session is established between the communicationplatform and the destination endpoint. The callback resource may be usedin detecting when the call is answered and beginning applicationexecution or connecting to another endpoint. Though, an API request maybe made to connect multiple endpoints.

The communication request is preferably for establishing an audiosession between at least two parties. In one variation, the two partiescan be the communication platform and a specified signaling and mediaendpoint. In another variation, the two parties can be thecaller/originating endpoint and a destination endpoint. The destinationendpoint may be specified in the request. The outgoing communication mayalternatively establish a video session, a chat messaging session, anapplication communication session (e.g., a multi-player gaming session),screen sharing session, multimedia session, presence informationsession, or any suitable application of a communication session. Onceinstructions have been processed instructing a communication router toestablish an outgoing communication, the communication router willpreferably make an outgoing INVITE SIP request to a specified endpoint.Alternatively, the request may be a REFER SIP request or any suitableSIP request. The method may alternatively or additionally be used withother protocols for establishing a session.

Block S120, which includes establishing media communication in asession, functions to initiate, bridge, or connect an originatingendpoint with a destination endpoint. The destination is preferablydefined by the username identifier of the destination endpoint. Thedestination endpoint will preferably be another telephony endpoint suchas a phone number, which will be connected through PSTN. A carrier canbe selected and used to establish a media communication with the phonenumber. Alternatively, the phone number could be an alternative endpointidentifier wherein the media connection is established with a proxysignaling and media service of that alternative mode of communication.In yet another variation, the phone number of alternative endpointidentifier may be destination registered within the platform, whereinthe method below for incoming communications may be used to establishthe media communication with another SIP user agent. Once instructionshave been processed instructing a communication router to establish anoutgoing communication, a communication router will preferably make anoutgoing INVITE SIP request to the specified destination endpoint.Alternatively, the request may be a REFER SIP request or any suitableSIP request. The method may alternatively or additionally be used withother protocols for establishing a session. If multiple endpoints aredefined and do not have an established signaling and/or mediaconnection, multiple endpoints may be contacted and included in themedia communication.

Block S130, which includes registering a callback resource to asignaling event of the session, functions to associate, instantiate, orcreate a webhook, reactive resource, or event handler that is notifiedas a result of session messages, signaling patterns, and optionallymedia events. The registration of a callback resource preferablyincludes receiving a specified callback URI to associate withcommunication events. The callback resource may be set for an account,for a sub-account, for an endpoint, for a particular pattern ofcommunication sessions, for a particular instance of communication(e.g., for the specific outgoing communication session) or for anyparticular categorization of communication sessions. A unique callbackresource can be specified for a specific event. The specific event ispreferably a type of signaling message, which may be the classificationof the signaling message (e.g., INVITE, Ringing, 200 OK, BYE, etc.). Thetype of signaling message can alternatively be a pattern that can bedefined by the parameters of a signaling message. For example, any SIPINVITE to an address with a particular area code in the user field ofthe ‘to’ field. A signaling event may also be defined by a set ofdifferent signaling patterns either generated by the communicationplatform or received from an endpoint. For example, a signaling event ofhang-up could be triggered from the BYE message and/or a timeout in thesignaling/media. Multiple callback resources can be registered to handledifferent types of signaling messages and/or to handle callbacks withdifferent scopes (e.g., one callback scoped for all sessions made inassociation with an account and a second callback scope for a particularsession instance). A multi-purpose callback resource may alternativelybe specified, which can be a callback resource to handle callbacks for avariety of callback events. An end user (e.g., an outside developer) canconfigure the multi-purpose callback resource to parse parameters passedin to the callback resource so as to handle different events. In oneexemplary implementation, the callback resource can be used in aSIP-based voice session and be triggered based on call events such ascall starting, ringing, pickup, answering machine, hang up, DTMF input,and/or any suitable event of SIP-based voice sessions. Callbackresources may alternatively be registered for any event of any suitabletype of communication session. The callback resource may additionally beshared between other modalities of communication. For example, acallback URI may be registered for voice session initiation for PSTNvoice calls and for SIP-based voice calls. The callback resource ispreferably stored in a table mapping the callback resource to an accountidentifier, an application identifier, and/or an endpoint identifier.

The callback resource may be registered through an administrator controlpanel interface, through an API, in headers of an outgoing communicationrequest, in the parameters of an outgoing communication instruction, orin any suitable location. In one instance, an outgoing communicationrequest includes a parameter that defines the callback resource. Theparameter can specify a callback resource URI or other suitableidentifier and optionally a signaling event definition. In anotherinstance, during a session, a signaling message can be received thatincludes a parameter defining the callback resource, wherein registeringa callback resource comprises registering the callback resourceaccording to the parameter in the signaling message. Accordingly,signaling messages can be processed to identify callback resourceregistration. In another instance, during the session, an APIcommunication can be received that identifies the session and specifiesa callback resource to register for a signaling message type. In anotherinstance a callback resource is registered according to account settingsassociated with the account making the outgoing communication. Accountsettings can be set through an administrator control panel or throughany suitable interface.

Other resources may additionally be configured for an account or anendpoint to promote robust SIP communication. A fallback URI may beconfigured to use if an application URI and/or a callback URI fails. Alost connection configuration may specify how a call is handled if acall is dropped. A lost connection configuration may direct the call toan error handling application URI (e.g., to read an error message andprovide options). A lost connection configuration may alternativelyspecify actions to be taken to reestablish the connection.

Block S140 and S150, which include monitoring signaling messages of thesession and detecting the signaling message type in the signalingmessages of the session, function to process signaling and mediatransactions of the communication session. The communication messagesmade by a user agent client (e.g., the caller) or a user agent server(e.g., the callee) are preferably monitored. If a communication routerdetects a communication that has an associated callback resource, thecallback resource is preferably triggered. The SIP communication may bemonitored for a Trying message, Ringing (e.g., call is ringing), OK(e.g., answered), Bye (e.g., hang-up) and/or any suitable type ofmessage. The transactional messages of SIP are preferably used to bridgeSIP communications to HTTP based world.

Step S160, which includes triggering the callback resource upondetecting the signaling message type, functions to notify, message, orsignal to a callback resource that an event has occurred. Triggering ofa callback resource preferably enables evented web functionality withSIP communication. Preferably, an application layer communication (e.g.,an HTTP request) is made to a configured callback resource URI. Thecallback resource URI is preferably a resource external to the platformand often controlled and/or operated by the account holder (though thecallback resource URI can reasonably be a service operated by anysuitable entity). The callback resource may alternatively be hosted andtriggered using any suitable protocol. Additionally, communication to acallback resource can be annotated with session metadata such as SIPspecific data associated with the session. Preferably, SIP data and/orother parameters from the communication session are passed as parametersin the HTTP request transmitted to the callback resource. For example,header fields of SIP transaction messages may be passed as parameters tothe callback resource. The response from a callback resource may be usedin the processing and handling of the communication session. Forexample, the callback resource may supply communication instructions toredirect the call, to hang-up, to record a conversation, to transcribe aconversation, or to perform any suitable action. The use of callbackresources preferably enables SIP-based communication sessions to followa HTTP request/response application model that many developers arefamiliar with from web development experience. In one variation, thecallback resource is triggered and takes appropriate action external tothe platform. A simple acknowledgment of being triggered may be returnedto the platform. In another variation, a callback resource can providean actionable response. The callback resource response can includecommunication instructions that are processed and executed inassociation with the session. For example, a response may be returnedwith telephony instructions that connect the session to anotherendpoint, enable media processing features, alter operating mode,execute telephony instructions, or direct any suitable form of actionwith the session.

As one exemplary use of the method, a SIP based communication sessionmay be established through an implementation of terminating SIP trunkingas described above. A client agent connected through a customer's IP PBXcan carry on a synchronous media communication session (e.g., voice,video, etc.) with a destination endpoint accessed over a carrier orotherwise. A callback application can be registered for the session suchthat the callback application is triggered on detection of a BYE signalcommunicated from the destination endpoint leg of the communication.When the destination endpoint hangs up, the BYE signal message isreceived. In response to the BYE signal message, the communicationplatform can transmit a communication to a URI of the callbackapplication. The callback application can take action within itsinfrastructure (e.g., logging, updating status, etc.) or alternativelyrespond with some communication directive to alter the media and/orsignaling of the session for the leg of communication with the remainingendpoints connected to the session. In one variation, the operating modecan be upgraded to enable telephony instruction processing or othersuitable media features.

In addition to using callback application registration to enablesignaling and media communication protocols programmable and responsive.The method may additionally include enabling media processing throughsignaling directives or account configuration. Media processing caninclude recording, transcription, and/or other suitable media processingprocesses that can be added on top of basic trunking orcommunication-bridging services. Media processing services can beenabled similar to registering a callback resource. Media processingfeatures can be enabled through an administrator control panelinterface, through an API call, in headers of an outgoing communicationrequest, in the parameters of an outgoing communication instruction, asa parameter passed in a signaling message during a session, or in anysuitable manner.

In another variation described more below, the destination SIP endpointscould be a signaling application modules that follow defined applicationlogic in response to data embedded in the destination endpoint. Forexample, multiple PSTN endpoints could be included in the user field,which may be contacted in parallel or in series until one answers thecommunication request.

2. Inbound Session Initiation Protocol Communications

As shown in FIG. 2, a method S200 for receiving inbound SIPcommunication of a second preferred embodiment can include receiving anincoming communication request S210, establishing a media communicationin a session according to the incoming communication request S220,registering a callback resource to a signaling event S230, inspectingcommunication signaling messages of the communication session S240,detecting the signaling event from the communication signaling messagesof the communication session S250, and triggering the callback resourceupon detecting the signaling event S260. The method of the secondpreferred embodiment functions to allow inbound calls or communicationrequests to connect to an endpoint managed by the communicationplatform. The inbound calls are preferably from an outside entity. In apreferred implementation, the method is used to bridge SIP communicationwith a HTTP request/response model as with the method of the firstpreferred embodiment. In alternative implementations of the method, themethod may be used in transitioning between basic SIP communications andapplication level communications. Basic SIP communications arepreferably those established through SIP trunking in an originating callflow as shown in FIG. 10. Basic SIP communications preferably providesimple communication connections (e.g., simply bridging a communicationsession between a SIP device and a PSTN device) with minimal orselective processing or controlling communication interactions. Themethod preferably provides a way to enable rich media interactionsinjected into lightweight signaling and media communication flows.

Block S210, which includes receiving an incoming communication request,functions to initiate communication with a destination. The destinationis preferably an endpoint managed by the communication platform. Theincoming communication request preferably originates from some form oforiginating endpoint. In one variation, the communication request is aSIP communication request. The SIP communication request preferablyspecifies a destination endpoint identifier. The incoming SIP requestmay be initiated by any suitable device or application. DNS ispreferably the mechanism in which the SIP communication request isdirected to the communication platform. The inbound SIP request ispreferably an INVITE request to start a communication session, but therequest may be any suitable initiating instruction. The INVITE requestmay be received from an outside carrier or communication system. Acarrier may use SIP or an alterative signaling and media protocol as amechanism for bridging PSTN initiated call to the communicationplatform. The carrier may alternatively be another VoIP provider.Alternatively, the INVITE request may be initiated from within thecommunication platform (e.g., communication between account instances).In a second variation, the communication request can be any suitableincoming communication such as a PSTN based phone call.

Block S220, which includes establishing a media communication in asession according to the incoming communication request, functions toinitiate, bridge, or connect an incoming communication with adestination endpoint. Preferably a media communication or stream can beestablished through the communication platform with the initiatingendpoint (i.e., caller leg) and at least one destination endpoint (e.g.,callee leg). The callee is preferably a signaling and media endpoint(e.g., SIP endpoint) connected through a public branch exchange or analternative proxy. The media may additionally be redirected throughadditional media services, which have been selectively enabled for thesession. For example, enabling of media services such as recording,transcription, analytics, API control, and/or other media processingfeatures may be enabled through account configuration and/or sessionconfiguration. An account holder on the communication platform canpreferably configure their account and optionally an IP PBX tofacilitate originating SIP trunking. As shown in FIG. 11, a carrier maydirect a SIP INVITE, REFER or other initiating signaling message to thecommunication platform. The addressing can specify an endpoint address(e.g., phone number, shortcode, endpoint identifier, etc.) in a userfield of a SIP address. The domain of the SIP address can be a domaincontrolled by the communication platform or otherwise redirected to thecommunication platform. In one implementation of the method, theendpoint address is mapped to an account. For example, an account mayhave one or more phone numbers registered within the communicationplatform. Within the account settings, the endpoint address can bemapped to a primary account routing configuration. The account routingconfiguration can specify a URI, domain name, or other identifier of aresource that can handle the signaling and media communication as shownin FIG. 12. The communication platform then sends an invite addressed tothe endpoint address within the resource specified in the accountrouting configuration. For example, the domain name of the accountholder's IP PBX replaces that of the communication platform in the “to”field of the INVITE request. Additionally, the caller endpoint can beused in the username of the “from” field but with a domain of thecommunication platform, which can function to provide an easy way tocall back the caller through the trunking service of the communicationplatform. Media can be established between the caller and the calleethrough the communication platform, and subsequent signaling can berouted through the communication platform.

Block S220 can include extracting an endpoint identifier which functionsto map a destination endpoint identifier with an endpoint of thecommunication platform. In one preferred variation, the destinationendpoint identifier in a signaled communication request will include alocal portion (e.g., a username or phone number) and domain portion. Thedestination endpoint identifier preferably maps to an endpoint record.The endpoint record is preferably a stored model of the endpointconfigurations, which may be stored in association with an account orsub-account. An endpoint record will preferably store a signalingendpoint, an application URI, and/or any callback URIs. Preferably, thecommunication platform maintains a database table that maps accountsecure identifiers to signaling endpoints or application secureidentifiers. A second database table may maintain a mapping ofapplication secure identifiers to application URIs. Other tables maymaintain callback URI's. In one exemplary implementation, the endpointidentifiers of the communication platform use a syntax pattern with anapplication secure identifier and an account secure identifier as thelocal portion of the endpoint identifier. An example of an endpointidentifier may be applicationSID@accountSID.example.com, whereaccountSID is a unique secure account identifier. The endpointidentifier is preferably specified in a header of the SIP invite, butmay alternatively be conveyed in any suitable parameter. The secureaccount identifier may be used in determining an application URI, anycallback URIs, and machine address (e.g., IP address). Any suitablepattern may be used in the endpoint identifier such that thecommunication platform can properly route the request. In anotherpreferred variation, the destination endpoint may be an endpointassociated with the protocol/medium of the incoming communication. Forexample, an incoming PSTN phone call may be directed at a phone numberdestination. The communication destination may additionally oralternatively be mapped to a signaling endpoint, an application URI,and/or any callback URIs in an endpoint record.

The incoming communication may additionally be authenticated. Due to thecommunication platform preferably being a multitenant platform, themethod preferably uses the authentication process in identifying andselecting the proper routing and application settings to use in thecommunication session. The authentication may be performed at the loadbalancer, prior to being directed to the communication router, at thecommunication router, or at any suitable point.

In one preferred embodiment, establishing media communication can dependon selectively routing media according to customizable mapping as shownin FIG. 12. The method S200 can include mapping a destination endpointspecified in the incoming com communication signaling request to aprimary account routing configuration; if the primary account routingconfiguration is a signaling endpoint, establishing a media streamcommunication of the communication session comprises routing aninvitation signal to the signaling endpoint and establishing the mediastream from a originating endpoint of the incoming communication requestand the signaling endpoint; and if the primary account routingconfiguration is an application resource identifier, establishing amedia stream communication of the communication session comprisesretrieving and processing an application specified by the applicationresource identifier to direct the media stream. The customizable mappingfunctions to enable a communication platform to provide a unifiedendpoint configuration system where an endpoint can be configured to berouted directly to a communication endpoint or to a communicationapplication with enhanced media processing. In this embodiment adestination endpoint identifier can be selectively invoke differentbehavior for different accounts. For example, some accounts would wantan endpoint to initially route to a SIP phone while other accounts maywant a telephony application to handle an inbound call. Additionally,the customizable mapping can include a secondary account routingconfiguration wherein upon detecting an error or other suitablecommunication event, establishing media communication according to thesecondary account routing configuration. The primary routingconfiguration and the secondary account routing configuration could be asignaling communication endpoint such as a SIP address or domain namefor an IP PBX resource or an application URI. In one account instance,an incoming call may be initially handled by a communication applicationand if that fails, fallback to connecting a SIP endpoint; while inanother account instance, an incoming call can be connected to a SIPendpoint, and if that fails, fallback to a communication application(e.g., instructing a text to speech service to announce an error andinstruct the caller to callback later). In other account instances, theprimary and secondary routing configurations may both be signalingendpoints or both be communication applications.

In the variation, where the account routing configuration includes asignaling endpoint, establishing media communication can includeestablishing media communication from the originating endpoint to thedestination of the signaling endpoint. For example if the signalingendpoint is “sip:pbx.example.com” and the call was to“sip:<phone_number>@<platform_domain>” then the destination connectedfor media communication can be “<phone_number>@pbx.example.com”. In onevariation, two endpoints are connected for voice, video, screen-sharing,or other suitable form of a synchronous/real-time communication.

In a related variation, the destination signaling endpoint could be asignaling application module that follows defined logic in response todata embedded in the signaling endpoint stored in the account routingconfiguration. If the signaling endpoint is a signaling applicationmodule, the communication platform preferably routes the messageaccording to the signaling endpoint logic above, but a signalingapplication module (a signaling and media proxy server) receives thecommunication request the invite is processed. Accordingly, the methodcan include routing to a signaling application module; at the signalingapplication module coordinating signaling with the signaling endpoint inaccordance with the metadata. In this variation, the signaling endpointincludes metadata embedded in the endpoint identifier, and the signalingapplication module is additionally identified.

The signaling application modules are preferably hosted and provided bythe communication platform, but outside entities could similarly hostand operate the signaling application modules. A signaling applicationmodule can preferably be referenced as part of a signaling endpointidentifier. Parameters that define functionality of the signalingapplication module are additionally a part of the signaling endpointidentifier. A signaling application module preferably functions toprovide a defined set of functionality that is commonly implemented formany users. A signaling application module could be defined to set up aconference call of multiple signaling endpoints, to call a set ofendpoints in parallel and only connect the first one to pick up, to calla set of endpoints in series one after the other, and/or to serve anysuitable use case. A web form or other suitable application can be usedby a user to input the parameters of a particular signaling applicationmodule instance, and the form outputs a signaling endpoint with theparameters appropriately embedded in the address as shown in FIG. 13.Additionally or alternatively, a library could be provided that includesa function to facilitate generating a signaling endpoint with theparameters appropriately embedded. The library may be used in makingoutbound calls in method S100. For example, a signaling applicationmodule that calls a set of numbers in parallel may be generated to callthree numbers in parallel and have a signaling endpoint of the pattern“<phone_number1>+<phone_number2>+<phone_number3>@parallelexample.com”,as shown in FIG. 14. The syntax of the signaling endpoint and embeddedparameters can be any suitable syntax. An INVITE or other communicationinitiation communication is preferably delivered to a resource of thesignaling application module. At the resource of the signalingapplication module, the signaling endpoint is parsed, interpreted, andapplied in signaling and media logic. In the above example, the threenumbers are extracted and then used as inputs to application logic thatcalls a set of endpoints in parallel. Signaling application modules canbe used in method S100 or in method S200.

In an alternative variation, an incoming SIP communication request mayspecify communication application instructions within the SIP request.In one preferred implementation, SIP request headers can specify SIPcommunication instructions. Communication instructions embedded in theSIP request function to enable an application to be defined specificallyfor an incoming SIP call. The communication instructions mayalternatively be specified in the body of the SIP request or in anysuitable portion of the request. The request can preferably enableapplication control without configuring an application, becausecommunication instructions can be configured directly in the SIPrequest. For example, a SIP request may enable one or more communicationfeatures of the communication platform by including the appropriatedirectives in the header of the SIP request. Using SIP requestinstructions may function to alleviate the system from providing fullapplication stack support for the communication if the desired featuresfor the communication are limited.

In the variation, where the account routing configuration includes aapplication resource identifier establishing media communication caninclude retrieving a communication application specified by theapplication resource identifier, which functions to send the request toan application server. A proxy core server preferably invites anapplication processing server (e.g., a call router), which thenretrieves and executes communication application instructions.Retrieving a communication application can additionally be in responseto the registered callback resource or optionally the secondary routingconfiguration used in error handling as shown in FIG. 15. Theapplication server preferably hosts or generates application logic thatcan instruct the communication platform how to process, handle, or routethe incoming communication request. A communication application ispreferably a remotely hosted resource that can be accessed over HTTP,SPDY, alternative application layer protocol, or any suitable networkprotocol. Alternatively, a communication application may be hostedlocally, within the communication platform, or accessed over anysuitable protocol. Preferably, a request is sent to an application URIand, more preferably, the request is sent to a URI mapped to theendpoint identifier. An application server is preferably a third partyserver and, more preferably, the server is hosting a web application.The request is preferably sent to a server over a network. In onevariation, the request is sent to a local server on a local areanetwork. In yet another variation, the request may be sent to multipleservers. The request preferably encapsulates at least a portion of thestate information from the communication request, such as theoriginating endpoint, the destination endpoint, the date and time of theinitiating request, geographic location of the caller (e.g., country,city, and/or state, zip), session identifier, and/or the unique call ID,or other state properties of the communication. The request, morepreferably, encapsulates all the state information of the call, but mayalternatively include no state information or partial state information.The state information from the initiated communication session ispreferably sent via HTTP POST in the request body, HTTP GET in therequest URI, HTTP header parameters to mimic the data flow of a webbrowser, or by any combination or suitable alternative way. Acommunication application is preferably retrieved prior to establishinga communication session between the at least two endpoints.Alternatively, the communication session may, at least initially, berouted to the appropriate destination for a basic communication session,such as providing simple SIP trunking.

The instructions of the communication application can be processed inestablishing media communication of the communication session. Thecommunication platform and more preferably a communication router canconvert the instructions of a communication application (e.g., serverresponse) into communication actions or executable operations during thecommunication session. The communication instructions/actions forvoice-based communication sessions may include, for example, playing apre-recorded sound file at a server-specified URI (such as a static mp3file located at http://demo.example.com/myapp/1234.mp3), reading text tothe caller using text-to-speech technology, calling another number (suchas creating a new voice connection through the PSTN, SIP/VoIP, or otherIP technology system), collecting digits via DTMF input, recording voiceresponse audio, TTY or other inputs, transcribing spoken words to text,sending an SMS/MMS message, putting a call on hold, ending a call,transferring a communication to another endpoint (e.g., other SIP-baseddevices, PSTN devices, or other suitable destinations), and/or anysuitable combination or sequence of these or other suitable actions. Thecommunication instructions may be any suitable instructions customizedto the particular medium of communication such as video, text/mediamessaging, screen-sharing session, multi-user application session, orany suitable medium of communication. In the variations, where at leastone feature is specified in the SIP request, the communication platformmay configure the communication request to use a subset of communicationresources. For example, if the SIP request included a header thatspecified that the call should be recorded and not processed by anapplication, then the communication session may flow through a resourcethat provides recording capabilities. Similarly, if the SIP request isdetermined to be one for SIP trunking, the SIP communication session maybe established using basic resources for the communication session(e.g., not processing with an application stack).

Block S230, which includes registering a callback resource to asignaling event, functions to associate, instantiate, or create awebhook, resource, or event handler reactive to the communicationsession. Block S230 is preferably substantially similar to block S130described above. The registration of a callback resource preferablyincludes receiving a specified callback URI to associate withcommunication events. The callback resource may be set for an account,for a sub-account, for an endpoint, for a particular pattern ofcommunication sessions, for a particular instance of communication(e.g., for the specific outgoing communication session) or for anyparticular categorization of communication sessions. A unique callbackresource can be specified for a specific event. A callback resource canbe registered through an account routing configuration. In thisvariation, all calls to an endpoint would have the callback resourceregistered. A callback resource may additionally or alternatively beregistered in response to header field or embedded parameter included ina signaling message. Such registration may require authenticationparameters to verify that the registration can be authenticated onbehalf of the corresponding account. For example, once a call isconnected to an account SIP phone through an IP PBX of the accountholder, the account holder could inject header parameters in a signalingmessage (e.g., an INFO signal) that registers a new or updated callbackresource and includes signed tokens to verify that the request comesfrom the account holder. A callback resource can additionally oralternatively be registered through an API request or through anysuitable mechanism.

Block S240 and S250, which include inspecting communication signalingmessages of the communication session and detecting the signalingmessage type in the communication signaling messages of thecommunication session, function to process signaling and mediatransactions or the communication session. Applied to SIP trunkingapplications, blocks S240 and S250 can include monitoring SIPtransactional messages. SIP transactional messages can be used tointeract with evented resources such that SIP initiated communicationsessions can be treated as request/response communications. Block S260,which includes triggering the callback resource upon detecting thesignaling message type, functions to notify, message, or signal to acallback resource that an event has occurred. Triggering the callbackresource preferably includes making an application layer communicationto an external resource specified by the callback resource. Blocks S240,S250, and S260 can operate substantially similar to blocks S140, S150,and S160.

3. Registering Session Initiation Protocol Endpoints

As shown in FIG. 16, a method S300 for integrating session initiationprotocol in a telecommunications platform of a third preferredembodiment can include receiving a SIP endpoint registration requestS310, authenticating the registration request S320, and updating aregistration record according to the registration request S330. Themethod S300 of the third preferred embodiment functions to register SIPendpoints to use the communication platform as a registrar for addressesof SIP communication. The method of registering SIP endpoints may beused in any suitable combination or variation of the methods describedherein. A SIP device or application is preferably configured to registeras a SIP endpoint of the communication platform. The communicationplatform preferably receives registration requests from the device orapplication and updates a maintained registration record so that thedevice can participate in communication sessions as shown in FIG. 17.The authentication of registration requests can provide a layer ofsecurity in the namespace of SIP endpoint registration. Additionally,the authentication of registration requests can be used in expanding theways endpoints are registered.

Block S310, which includes receiving a SIP endpoint registrationrequest, functions to obtain a notification for a registration update ofat least one SIP endpoint on the communication platform. Theregistration request is preferably to add a new SIP endpoint, update anexisting SIP endpoint, or remove an existing SIP endpoint. Theregistration request may originate from a device requesting to beregistered. For example a SIP-based phone may be registered. As anotherexample, a client device may use an application to register. Theregistration request may alternatively be transmitted over an API,submitted through an administrator user interface, or received from anysuitable source.

The registration request preferably specifies a namespace identity and adevice identity. The namespace identity preferably includes acommunication platform identity (e.g., an account id) and a domain name.The communication platform identity is preferably an account identifierthat functions as an account denormalizer. The communication platformidentity may alternatively be a username, account secure id, sub-accountid, or any suitable identifier for an entity of the communicationplatform. The communication platform identity may additionally includean application identifier. The domain name preferably conforms to DNSrouting. The DNS is preferably configured to route SIP communication tothat domain to the communication platform. For example, the namespaceidentity may be example123@example.com, where example123 refers to aparticular account and example.com is used as the domain name in routingSIP requests. In one variation, accounts of the communication platformmay be allowed to use a predefined domain name space. In anothervariation, accounts may be able to use any suitable verified domain.Verifying a domain may include receiving DNS configuration for a domain,accessing a verification signature at specified location of the domain(e.g., retrieving a text document with a verification signature from theroot of the domain), using an authentication callback of the domain,completing an authentication process with the domain (e.g., oauth), orcompleting any suitable authentication process. Additionally, the domainregistration techniques may be extended to using outside account systemsfor registering a namespace identity such as completing oauthauthentication to use a social network identity as the namespaceidentity. The device identity preferably includes the IP address andport to contact the device, but any suitable addressing scheme mayalternatively be used. A registered device may additionally beconfigured with a preferred transport such as TLS, UDP, SCTP, WebSocket,TCP, or any suitable protocol, but the use of DNS may also resolve thepreferred transport.

Block S320, which includes authenticating the registration request,functions to add a layer of security prior to changing any records. Asmentioned the communication platform is preferably a multitenantplatform managing multiple accounts. Authenticating the registrationrequest preferably verifies the identity of the request. Theauthentication may be used in authenticating that the changes to theregistration records of the communication platform are allowed. Areceived registration request is preferably authenticated prior toupdating registration records. In one variation, a device is preferablyconfigured with an authentication token that is passed to thecommunication platform along with the registration request. Thecommunication platform, upon receipt of the authentication token,preferably verifies the token for the registration request. If theauthentication token is deemed valid, the registration request isprocessed.

Preferably, an outside service may be queried for permission. Forexample, a callback URI may be expected for at least a subset ofdomains. The callback URI may be based on the domain name of thenamespace identifier in the request. The callback URI may alternativelybe preconfigured, registered, or mapped by the communication platform touse a particular authentication technique. An authentication request ispreferably transmitted to the callback URI along with at least a subsetof information from the registration request. The outside resource willpreferably perform any suitable authentication and then respondindicating if the registration request is allowed or denied. A preferredembodiment may employ the use of a callback URI to authenticate anysuitable SIP communication (in addition to or in place of authenticatingregistration).

In one preferred implementation, authentication of the request may use apolicy engine that functions to provide authentication for connectionrequests. The policy engine preferably authenticates a registrationrequest from the client prior to completing the registration. The policyengine is preferably used in the authentication process of a preferredembodiment in a manner substantially similar to the authenticationapproach described in U.S. patent application Ser. No. 13/478,495 filed23 May 2012, herein incorporated in its entirety by this reference. Thepolicy engine preferably authenticates the request by using a tokenassociated with the client and analyzing a signed client communicationfrom the client. If the client communication satisfies theauthentication, a preferred embodiment preferably adds or updates theregistration in response to client authentication at the policy engine.If the client communication fails to satisfy the authentication, anerror may be logged and any suitable error response may be taken.Preferably, the token is sent from the client. In one variation, theclient has an embedded token from when an application was instantiated.In another variation, a communication can be made to an authenticationapplication to retrieve a token. Alternatively, a client identifier issent to a policy engine that has an authentication applicationauthenticate the credentials of the client identifier. Similarly, a SIPbackend authentication may alternatively be used. The authentication mayoccur for registration and/or outbound communications. The tokenpreferably includes an application ID and any additional parameters. Thecontents of a token are preferably signed with a secret key. A policyengine preferably completes authentication of the token before allowinga registration to complete. A policy engine preferably mediates the callout requests and authenticates any tokens, and may additionally verifypermissions associated with application identifiers. Any suitablealternative forms of authentication may alternatively or additionally beintegrated into the method. Such security measures may additionally oralternatively be used in authentication and/or authorization for othermethods and systems of preferred embodiments described herein.

The authentication may additionally or alternatively be in place toauthorize that the request has legitimate permissions to use theincluded credentials. For example, if the registration request specifiesa namespace with an outside domain name, the communication platformpreferably verifies that the requester has permissions to use thatoutside domain. Verifying outside permissions may additionally result inupdating or requesting updates in outside services such as making DNSchanges. Permissions may additionally be authorized. Permissions maydetermine the actions allowed by the registered device. The numbers thatcan be called from that number or the numbers that can call in to theregistered device may be limited. The modes of communication such as amessaging, voice sessions, video sessions, screen sharing sessions,application sessions, or other modes of communication may be set in thepermissions. In one variation, a device may be limited to registrationonly and receiving calls. Any suitable permissions may be applied to adevice.

Block S330, which includes updating a registration record according tothe registration request, functions to add, augment, or removeregistration records from the communication platform. The registrationrecords are preferably stored in an accessible registration database.Routing tables and/or any suitable routing data or models mayadditionally be maintained such that inbound and/or outboundcommunication sessions can be established for the registered devices. Inone use case, updating a registration record includes adding a deviceregistration to the registration records. In another use case, updatinga registration record includes editing information of an existing deviceregistration. For example, the IP address may need to be updated for aregistered device when the device changes to a different wife network.The device will preferably transmit a new registration request to updatethe new IP address. In another use case, updating a registration recordincludes removing, deleting, or deactivating a registered device fromthe registration records. Any suitable update may alternatively be made.In one variation, multiple devices may be configured for a singleendpoint. The multiple devices may be configured for any suitablecooperative use. In one example, multiple devices are prioritized sothat if the highest priority device is not answered then the nexthighest priority device is called.

The method may additionally include routing inbound communicationaccording to the registration record. An inbound communication may bereceived over any suitable mode of communication. The mode ofcommunication may include messages, voice sessions, video sessions,screen sharing sessions, application sessions, or any suitable mode ofcommunication. The inbound communication is preferably a SIPcommunication, but the inbound communication may have been initiatedfrom any suitable protocol such as PSTN. Upon receiving an inboundcommunication, the registration database is queried to find theappropriate registration record. The registration record will preferablymap a communication platform identifier (e.g., account identifier) to adevice identity (e.g., a current IP address of the device). The inboundmay simply specify the communication platform identifier to connect tothe proper registered device. Additionally or alternatively, the inboundcommunication may specify a telephony endpoint such as a telephonynumber or short code, a username, or any alternative identifier. Thecommunication platform preferably includes a database record mapping thealternative identifier to at least the communication platformidentifier. For example, if the inbound communication specifies a phonenumber, that number is preferably mapped to an account identifier andthen subsequently mapped through the registration database to a currentIP address of the device.

Additionally, the method for registering SIP endpoints may includeproviding access to the registration data. Information from theregistration database can preferably be accessed through an API. Theregistration database may be accessed through a REST API, a clientinterface (e.g., a JavaScript frontend interface), a device SDKinterface (e.g., iOS or Android SDK interface), and/or any suitableinterface. The interface can preferably be used to programmaticallyinteract with the registration, see who and what devices are registered,see who is online, history of registration, duration of registration,location of registration, the permissions of registered users (e.g., whois registered to call a particular endpoint) and/or any suitableproperty of registration. The data in the registration database ispreferably associated with at least one account, sub-account, orapplication id. Requests submitted through the interface preferablyauthenticate so that the permissions to access the requestedregistration information can be authorized.

4. Method for Transitioning Between SIP Operational Modes

As shown in FIGS. 18 and 19, a method S400 for transitioning between SIPoperational modes of a preferred embodiment can include establishing SIPcommunication session in a first mode S410, receiving a transitionsignal S420 and altering the operational mode of the communicationsession S430, which functions to change the resources used in processingthe communication session. The variation preferably functions to enablebasic SIP communication sessions (e.g., SIP trunking communicationsessions) to be elevated to a communication processed by the applicationstack of the communication platform as shown in FIG. 18. Similarly, thevariation may be used to demote a communication session usingapplication/processing resources to use less or basic communicationsessions as shown in FIG. 19. The operational modes thus preferablyinclude a basic communication mode and an application stackcommunication mode, but any alternative operational mode may be used. Inone variation, an operational mode may be defined for a particularfeature or set of features of the application mode. For example, anoperational mode may exist that routes the call through call recordingresources. The basic communication mode is preferably used when a callor communication session is established from SIP trunking. Thecommunication platform preferably established the SIP communicationsession, which is ran through a SIP proxy of the communication platform.The application stack communication mode is preferably used when acommunication router uses a retrieved communication application whenprocessing a communication. When in an application stack communicationmode, the SIP session preferably has full application capabilities. Anapplication can preferably modify state of the SIP session and performactions such as redirect the call, hang-up, record a conversation,transcribe a conversation, send an message (e.g., SMS, MMS, applicationmessage), merge the call, and/or to perform any suitable action.

Step S410, which includes establishing SIP communication session in afirst mode, functions to establish either a communication session in abasic, application, or another alternative communication mode. Themethod may be used to promote or demote the SIP communication mode.Additionally, modes may be changed any suitable number of times. Asshown in FIG. 20A, a basic SIP communication mode may be promoted to usethe capabilities of an application communication mode. As shown in FIG.20B, a SIP session in an application communication mode may be demotedto forgo the application capabilities and operate in the basic SIPcommunication mode. As illustrated in FIGS. 20C and 20D, thecommunication mode may switch multiple times. The established SIPcommunication is preferably established in a manner substantiallysimilar to the methods described above, but the SIP session mayalternatively be established in any suitable manner.

Step S420, which includes receiving a transition signal, functions toobtain or identify a trigger to change modes of SIP communication. Thetransition signal may be received at any suitable point. The transitionsignal is preferably established and triggered through the programmaticfeatures discussed above in methods S100 and S200. In one variation, thetransition signal may be communicated in a SIP message. Either party maybe able to trigger the altering of the operational mode of thecommunication session. Preferably, the SIP signaling may include anapplication ID, an authentication token, and/or any other credentials tospecify how to transition the communication (e.g., which app to givecontrol to and indicate the request is authentic and/or authorized). Thetransition signal may alternatively be submitted through an API request(preferably a REST API request). The REST API preferably has a resourcein which the SIP session may be accessed and acted upon. The REST APIpreferably specifies the new mode of operation and, in the case ofpromoting the communication to an application communication mode, theREST API request may specify parameters for what application shouldinitially control state. In yet another variation, a callback URI may beregistered for a communication session and/or an endpoint so that theaction may be triggered based on the SIP messages. For example, acallback may be registered for a basic SIP communication session so uponone of the endpoints hanging up the other endpoint is changed to anapplication communication mode with a pre-specified application. Whenthe communication session mode is an application communication mode, aninstruction of the application may trigger the change in the operationalmode, essentially ending the application control of that application.

Step S430, which includes altering the operational mode of thecommunication session, functions to update the communication platform touse the appropriate resources to manage the communication session. Whenin a basic communication mode, the communication session is preferablyrouted through a SIP proxy. When in an application communication mode,the communication session is preferably routed through at least acommunication router where at least a portion of an application isperformed. When transitioning to the application communication mode, thesteps associated with initiating a communication session with thecommunication platform are preferably performed in a substantiallyconsistent manner. In one variation, if the communication is returningto the application communication mode for a second time, thecommunication router may remember at least partial state within theprocessing of application instructions. For example, if an applicationtransfers the call to a basic mode, and then the call is returned to theapplication, the instructions after the initial transfer may beperformed without having to retrieve new application instructions.

The method S400 is preferably used in combination with the methods S100and S200 described above. Various signaling and media managementapproaches can be applied to achieve transitioning between operatingmodes. Altering the operational mode preferably includes onboarding newmedia and signaling resources into the session when upgrading anoperational mode off boarding signaling and media resources of thesession when downgrading, and/or otherwise modifying the set ofsignaling and media resources when transitioning.

As shown in FIG. 21, a SIP re-INVITE mechanism can be employed toupgrade or alternatively transfer a session. An existing signalingdialog can exist between a transferee (the entity that experiences thetransition), the communication platform, an IP PBX and a SIP user agent.As shown in FIG. 21, the user agent can initiate the transfer.Alternatively the transfer may be initiated through an API, triggeringof a registered callback, or initiated through any suitable mechanism. AREFER signaling message can be delivered which prompts the invite of thespecified referrer, the target. The target could be another carrier orcould be a communication application service. By supporting a SIP REFERmessage, the communication platform may support allowing any endpoint,including carriers, to do various transfer scenarios, which can includeupgrading to an application operating mode. As shown in FIG. 22, analternative signaling and media handling process accepts a REFER messageto transition to an application mode. The referrer will preferablyspecify a referring endpoint. An INVITE to the endpoint is processedthrough the proxy core. As shown in the example of FIG. 22, the endpointcan be an application identifier such that the media communication willflow from the carrier through the carrier-media-gateway and thecommunication application service. The signaling and media flow cansimilarly use REFER to transition to targeting an external domain asshown in FIG. 23. The trunking app can additionally monitor when thetransition occurs and meter the associated account appropriately suchthat an account may be billed at one rate when in SIP trunking mode anda second rate when in application mode. In another variation, the REFERmay be handled through an edge service as shown in FIG. 24 where thepublic media gateway (PMG) facilitates upgrading the operation mode.Similarly, handing the REFER transparently at the edges could enableusers to REFER to anything at any time, such that if operating in anapplication mode, the session could transition to a SIP trunking mode.

In one exemplary implementation, a basic communication mode may beprovided by the communication platform at one usage rate and anapplication communication mode provided at a second usage rate. SIPtrunking can use basic communication where communication is preferablychanneled between the communicating endpoints. Since facilitating thebasic communication session requires fewer/cheaper resources, SIPtrunking communication sessions may be offered to users for a lowerprice. An agent, application, or service can preferably submit atransition signal if an entity decides to dynamically change the basiccommunication to use features of an application or service of thecommunication platform. Upon transitioning to the elevated operationalmode, the communication session may be charged at a higher price ratefor use of the application resources. The transition signal ispreferably received through an API request, but may alternatively bereceived through any suitable channel. The variation of transitioningthe operational mode of a communication session may additionally oralternatively be used with the method of the second preferred embodimentor during any established communication session.

The altering of the SIP communication mode may have numerousapplications. In one exemplary use-case, an agent may be connected to acustomer representative through a SIP session. The account associatedwith the phone number of the customer representative is preferablycharged the basic communication mode rate (e.g., $0.001/min). When thecustomer representative has finished, a transition signal is preferablyreceived, and the customer is seamlessly transitioned to a SIPcommunication session in an application communication mode. With thefull capabilities of the application stack, a customer surveyapplication may collect feedback from the customer before ending thecall. During this survey application portion, the account may be chargedan application customer mode rate (e.g., $0.01/min). In this example,the account was able to easily add a survey application withoutsignificantly increasing the cost of basic SIP communication. Thecommunication mode changes are preferably transparent to the customer.In another exemplary use-case, a customer may call an endpoint for acalling card service. The call preferably starts the communicationsession in an application communication mode. The customer enters thecode, and specifies the destination they wish to call. The applicationthen transfers them to the desired number. For the portion of thecommunication session with the desired endpoint, the communicationsession is preferably demoted to a basic communication session tobenefit from a lower rate. The caller may additionally be transferred toan application communication mode at the end of the call for otherapplication related services, such as reading the balance of the callingcard and the option to call another number. The altering of thecommunication mode may be used in any suitable application.

The system and methods of the preferred embodiment and variationsthereof can be embodied and/or implemented at least in part as a machineconfigured to receive a computer-readable medium storingcomputer-readable instructions. The instructions are preferably executedby computer-executable components preferably integrated with thecommunication platform. The computer-readable medium can be stored onany suitable computer-readable media such as RAMs, ROMs, flash memory,EEPROMs, optical devices (CD or DVD), hard drives, floppy drives, or anysuitable device. The computer-executable component is preferably ageneral or application specific processor, but any suitable dedicatedhardware or hardware/firmware combination device can alternatively oradditionally execute the instructions.

As a person skilled in the art will recognize from the previous detaileddescription and from the figures and claims, modifications and changescan be made to the preferred embodiments of the invention withoutdeparting from the scope of this invention defined in the followingclaims.

What is claimed is:
 1. A method comprising: at a multi-tenantcommunication platform system that includes a SIP (Session InitiationProtocol) communication router and a callback engine: detecting, usingthe callback engine, a SIP signaling event message that is registered inassociation with a callback URI from a plurality of communicated SIPsignaling event messages communicated for a SIP communication session ofthe SIP communication router, the plurality of communicated SIPsignaling event messages including at least one of a SIP signaling eventmessage provided by the communication router and a SIP signaling eventmessage received by the communication router, the callback URI beingregistered for an account of the communication platform system, thecallback URI being a URI of an application of an external system of anaccount holder of the account; responsive to detection of the SIPsignaling event message by the callback engine, providing an applicationlayer request to the external system of the account holder, theapplication layer request specifying the callback URI.
 2. The method ofclaim 1, further comprising, at the platform system and during the SIPcommunication session, responsive to a signaling message that includes aparameter defining the callback URI: authenticating tokens included inthe signaling message; and verifying the account, wherein the callbackURI is registered according to the parameter in the signaling message.3. The method of claim 1, wherein the callback URI is registeredresponsive to a received application programming interface (API)communication that identifies the SIP communication session andspecifies the callback URI.
 4. The method of claim 1, wherein theregistered SIP signaling event message indicates that mediacommunication is ending.
 5. The method of claim 4, wherein responsive todetection of the SIP signaling event message by the callback engine, theplatform system enables a communication application mode.
 6. The methodof claim 5, further comprising, at the platform system, accounting usageby the account in an original communication mode and accounting usage inthe communication application mode, wherein usage in the originalcommunication mode is distinct from usage in the communicationapplication mode.
 7. The method of claim 5, further comprising, at theplatform system, transitioning from the communication application modeto a basic communication mode.
 8. The method of claim 1, furthercomprising, at the platform system, enabling media processing during theSIP communication session, wherein media processing includes selectivelyenabling media recording during the SIP communication session.
 9. Themethod of claim 1, further comprising: mapping a destination endpointspecified in an incoming communication signaling request to a primaryaccount routing configuration; in a case where the primary accountrouting configuration specifies a signaling endpoint, routing aninvitation signal to the signaling endpoint and establishing mediacommunication between an originating endpoint of the incomingcommunication request and the signaling endpoint; and in a case wherethe primary account routing configuration specifies an applicationresource identifier, retrieving an application specified by theapplication resource identifier and processing the application indirecting media communication of the SIP communication session.
 10. Themethod of claim 9, wherein the signaling endpoint includes metadataembedded in the endpoint, the method further comprising: routing theincoming communication signaling request to a signaling applicationmodule; at the signaling application module, coordinating signaling andmedia control according to the metadata.
 11. The method of claim 9,further comprising: mapping the destination endpoint to a secondaryaccount routing configuration; responsive to detection of an errorevent, establishing media communication of the SIP communication sessionaccording to the secondary account routing configuration.
 12. Amulti-tenant communication platform system comprising: a SIP (SessionInitiation Protocol) communication router; and a callback engineconstructed to detect a SIP signaling event message that is registeredin association with a callback URI from a plurality of communicated SIPsignaling event messages communicated for a SIP communication session ofthe SIP communication router, the plurality of communicated SIPsignaling event messages including at least one of a SIP signaling eventmessage provided by the communication router and a SIP signaling eventmessage received by the communication router, the callback URI beingregistered for an account of the communication platform system, thecallback URI being a URI of an application of an external system of anaccount holder of the account, wherein responsive to detection of theSIP signaling event message by the callback engine, the communicationplatform system is constructed to provide an application layer requestto the external system of the account holder, the application layerrequest specifying the callback URI.
 13. The system of claim 12, whereinduring the SIP communication session and responsive to a signalingmessage that includes a parameter defining the callback URI, theplatform system is constructed to: authenticate tokens included in thesignaling message; and verify the account, and wherein the callback URIis registered according to the parameter in the signaling message. 14.The system of claim 12, wherein the callback URI is registeredresponsive to a received application programming interface (API)communication that identifies the SIP communication session andspecifies the callback URI.
 15. The system of claim 12, wherein theregistered SIP signaling event message indicates that mediacommunication is ending.
 16. The system of claim 15, wherein responsiveto detection of the SIP signaling event message by the callback engine,the platform system is constructed to enable a communication applicationmode.
 17. The system of claim 15, wherein the platform system isconstructed to account usage by the account in an original communicationmode and account usage in the communication application mode, whereinusage in the original communication mode is distinct from usage in thecommunication application mode.
 18. The system of claim 15, wherein theplatform system is constructed to transition from the communicationapplication mode to a basic communication mode.
 19. The system of claim12, wherein the platform system is constructed to enable mediaprocessing during the SIP communication session, wherein mediaprocessing includes selectively enabling media recording during the SIPcommunication session.
 20. The system of claim 12, wherein the platformsystem is constructed to: map a destination endpoint specified in anincoming communication signaling request to a primary account routingconfiguration; in a case where the primary account routing configurationspecifies a signaling endpoint, route an invitation signal to thesignaling endpoint and establish media communication between anoriginating endpoint of the incoming communication request and thesignaling endpoint; and in a case where the primary account routingconfiguration specifies an application resource identifier, retrieve anapplication specified by the application resource identifier and processthe application in directing media communication of the SIPcommunication session.